Amperex made Marked Heinz and Kaufman. Look and test new, no original boxes. These all test at exactly new spec. See pics for condition and test details.
Item Tag: E80F
LOT OF 5 E80F PHILIPS/AMPEREX audio tubes – NOS –
1 LOT OF 5 TUBES E80F TUBES NOS. 1 AMPEREX “PQ” QUALITY.